GRANULOSA CELL TUMOR IN A SIX-YEAR-OLD GIRL PRESENTED AS PRECOCIOUS PUBERTY

Ovarian sex cord-stromal tumors, including granulos e cell tumors (GCTs), are a group of neoplasms that occur rarely, especially in children. Only 0.1 percent of all ova rian tumors and 4-5 percent of GCTs occur in childr en. The most common presentation of these tumors in children is precocious puberty. We report a 6 years old girl with isosexual precocity, presented as premature thelarche and vagina l bleeding. Ultrasonography of pelvis showed a hypo echoic solid mass of left ovary. Microscopic features of the resected mass were char a teristic of juvenile GCT. Although in most of gir ls with precocious puberty, the etiology is idiopathic, importan t causes, such as ovarian tumors must be considered .

ranulosa cell tumors of ovary were first described by Rokitansky in 1855. 1 There are a group of cells in juvenile granulosa cell tumors (JGCT) with ability to secret steroid hormones, similar to the steroid hormone-secreting cells. 2 They are benign tumors as a subgroup of ovarian sex cordstromal tumors.
Pseudo precocious puberty is the most common presentation in young children. In older ages and adolescents, they cause other manifestations such as hirsutism, abnormal uterine bleeding and abdominal discomfort.
The prognosis of the JGCT is excellent after salpingooophorectomy in patients who have only ovarian involvement. 3 This report describes a 6-year-old girl with isosexual precocity as premature thelarche and vaginal bleeding. Ultrasonography of pelvis showed a hypoechoic solid mass in close proximity of the left ovary. Microscopic features of the resected mass were characteristic of JGCT.

Case Report
A girl, aged 6 years, with no significant past medical history presented with breast enlargement and intermittent periumblical abdominal pain of 4 months duration that was accompanied with nausea but without vomiting. She had no headache or visual complaint. At that time, medroxy progesterone, 5 mg PO daily was started with impression of pseudoprecocious puberty, because sonography of pelvis showed a cystic mass in left ovary. After several weeks, she developed intermittent vaginal bleeding and the drug was increased to 10 mg PO daily and LHRH agonist was added and she was referred to the Pediatric Endocrinology clinic in our medical center. When she was visited, her weight was 21 kg G www.SID.ir and her height was 120 cm. Breast enlargement and pubic hair were compatible with Tanner III. No abdominal mass was palpated in the abdomen. Her serum laboratory findings were consistent with peripheral precocious puberty: estradiol: 216 pmol/L; FSH: less than 0.5 IU/L; LH: less than 0.4 IU/L; DHEA-so4: less than 36 ng/ml; testosterone (total): 0.3 ng/ml; 17-OHµ progesterone: 0.3 ng/ml; total T4: 9.1 g/dl; TSH: 2.4 mIU/L; alpha-fetoprotein: 2 ng/ml. LHRH test was done without increase in LH and FSH. Ultrasonography of pelvis showed a 6.2 × 5 × 4.1 cm hypoechoic solid mass in projection of left adnexa which had multiple cystic structures up to 1.2 cm, and left ovary could not be separated from it. Right ovary was normal. The size of uterus was appropriate for the patient's age, with normal endometrial and myometrial echo pattern. Endometrial thickness was 5 mm and no free pelvic fluid was detected by sonography. The spiral CT scan of pelvis showed a large non-uniform solid mass with multiple necrotic regions in the lower abdomen. So, we recommended diagnostic and therapeutic laparotomy for her. Under general anesthesia, laparotomy was done. An ovarian mass in the left side with diameters of 5 × 7 cm was detected and resected with left ovary. The right ovary was normal. No lymphadenopathy was detected in the pelvic area. The mass was sent for histopathologic study and ovarian JGCT was reported ( Figure 1).

Discussion
Ovarian sex cord-stromal tumors are neoplasms containing granulosa cells, sertoli cells, theca cells, leydig cells, and fibroblasts of gonadal stromal origin. 4 GCTS can be categorized into juvenile and adult subtypes based on their histology. 5 Only 0.1 percent of all ovarian tumors and 4-5 percent of GCTs occur in children. 6 Isosexual precocity occurs in 70-80 percent of prepubertal girls with GCTs. [6][7][8] However, only 1 percent of all cases of sexual precocity in prepubertal girls are due to granulosa and theca cell tumors. 9 Clinicians should be fully aware of pseudoprecocious puberty. There is high level of sex hormones and suppressed gonadotropins level in this condition.
They should exclude primary gonadal disorders, adrenal gland, exogenous secretion of gonadotropin by a tumor, or autonomous ovarian cyst. 10 Patients with recurrent ovarian cyst formation, and persistence of the cysts especially with a significant solid component beyond three months should alert a clinician to the possibility of the ovarian JGCT. 10 In our case, sonography of the pelvis showed ovarian cyst of solid component. An extensive review of the literature showed that primary ovarian tumors and steroid cell tumors are rarely seen in prepubertal children, less than 5%. 11 In reviewing the literature from 1925 to 1944, seckel found 31 case reports of ovarian granulose cell tumors with sexual precocity. 12 The signs of isosexual precocity are reported to develop uniformly. Alveolar pigmentation and breast development are the initial changes, followed by a white vaginal discharge and uterine bleeding, and finally, by development of downy pubic hair. 13 Advanced bone age and accelerated height velocity were seen due to tumor-derived estradiol. 3 Our patient was presented with breast enlargement followed by vaginal bleeding, while restlessness, irritability, and fever have been noticed in some patients, 14 and increased sweating, apathy and ascitis are reported in others. 15 About 90 percent of JGCT are diagnosed in stage 1 and have a good outcome, but those at progressive stages have poor prognowww.SID.ir sis. 11 On CT and sonography, they most typically appear as large, multilocular masses, with either thin septations or thick, irregular septations, as well as solid components or large multicystic mass. 16 In our patient, the sonography and CT scan of pelvis showed a solid ovarian mass. After confirmation of the diagnosis, appropriat treatment should be insti-tuted. Surgery should be performed in this age group with unilateral oophorectomy only for stage one. 17,18 Adjuvant chemotherapy is not useful for stage one. 19 In our patient, left oophorectomy was done and the response to treatment was good after 4-6 months of follow up with regression in breast size and decrease in the serum estradiol level.